Volume 616, August 2018
|Number of page(s)||5|
|Section||Letters to the Editor|
|Published online||15 August 2018|
Letter to the Editor
Possible ~1 hour quasi-periodic oscillation in narrow-line Seyfert 1 galaxy MCG–06–30–15
Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, PR China
2 Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263 001, India
3 Center for Field Theory and Particle Physics and Department of Physics, Fudan University, 220 Handan Road, Shanghai 200433, PR China
4 Department of Physics, The College of New Jersey, PO Box 7718, Ewing, NJ 08628-0718, USA
5 Theoretical Astrophysics, Eberhard-Karls-Universität Tübingen, 72076 Tübingen, Germany
6 Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Lu 5, Hai Dian District, Beijing 100871, PR China
7 Department of Astronomy, Peking University, Yi He Yuan Lu 5, Hai Dian District, Beijing 100871, PR China
Accepted: 19 July 2018
We found a possible ~1 h quasi-periodic oscillation (QPO) in a ~55 ks X-ray observation of the narrow-line Seyfert 1 galaxy MCG–06–30–15 made with the XMM-Newton EPIC/pn detector in the energy range 0.3–10 keV. We identify a total modulation of ~16% in the light curve and find a ≃3670 s quasi-period using Lomb-Scargle periodogram (LSP) and weighted wavelet Z-transform (WWZ) techniques. Our analyses of eight light curves of MCG–06–30–15, indicated the possible presence of an oscillation during one of them. The LSP indicates a statistically significant (≃3σ) QPO detection. A WWZ analysis shows that the signal at this possible roughly 3670 s period is present, and rather persistent, throughout the observation; however, a signal around 8735 s is more persistent. We briefly discuss models that can produce X-ray QPOs with such periods in narrow line Seyfert 1 galaxies, as both other claimed QPO detections in this class of AGN had very similar periods.
Key words: galaxies: active / galaxies: Seyfert
© ESO 2018
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